What companies other than Google use an "adwords" model?

I hear about a lot of advertising companies using an "adwords" model. What are some examples? How are they different?
Answer:

Yahoo! / Bing uses a similar bidding-for-clicks (PPC) approach. You can find out the details on the Bing website by "googling" for bing advertising.

Miles Abernathy at Quora Visit the source

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Other answers

Some other third tier search engines are 7search and AdKnowledge. You can often get conversions at a much cheaper cost than with AdWords. At my company we ran a case study evaluating the performance of some third tier search engines you can read here: http://www.ppchero.com/low-cost-ppc-traffic-driving-without-using-google-and-msn/

Bethany Bey

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